Year: 2016 | Month: August | Volume 9 | Issue 4
Inheritance of sheath blight disease resistance in submergence rice (Oryza sativa L.)
Abstract:
Sheath blight caused by Rhizoctonia solani Kuhn is one of the important diseases of rice, resulting in heavy yield loss in rice every year. Genetic nature of sheath blight has been found to be complex and controversial issue in the earlier studies. There were some reports about the major gene conferring resistance to sheath blight. Non allelic dominant major resistance gene was also reported in resistant cultivars. A total of 50 QTL associated with sheath blight resistance located on all 12 rice chromosomes have been reported, with 10 of these co-localizing with QTL for morphological attributes, especially plant height, or for heading date. The objective of this paper was to see inheritance pattern of sheaath blight. All the plant in the F1 shown resistant reaction with 22.25% disease severity, and in F2 population the resistant or moderately resistant, and susceptible in the ratio of 3R / MR: 1S which is mainly due to presence of dominant effects of resistant QTL/genes qSBR11-1. The F3 populations were classified into resistant, moderately resistant and susceptible in the ratio of 3:2:3. Further, the F3 populations were classified in only two groups as resistant and susceptible then their ratio was 5Resistance/Moderatily Resistance: 3Susceptible.
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